Imphal Police on Wednesday arrested four cadres of PLA engaged in extortion activities.Imphal west senior SP, L Kailun said that the four PLA cadres were among seven nabbed by the police commandos in joint operations along with the troops of 26 and 28 Assam Rifles at different places in the last two days.Mayanglambam Shamungou (44) of Kyamgei, Yambem Narayan (50) of Kakching, Soyam Chaoba (44) of Sega Road Khwairakpam Leikai and Thangjam Romen (42) of Pungdongbam Mayai Leikai were nabbed yesterday from two separate places by the combined team, the Senior SP said.Further verification revealed that the cadres had extorted huge money from general public, various government department and private schools as party fund for the outfit. Also two mobile handsets were seized from them.Meanwhile, in another operation, two cadres of KYKL and one PREPAK were also nabbed by the same combined force identified as Naorem Arun @ Karou (23), Angousana (28) and Meisnam Kuber (34).Further, one Smith (Wesson) pistol along with magazine loaded with six and one AK-56 rifles (made in China) with a magazine and two live rounds were seized from them.